He said in May 2015, Google came out with a stat that 15% of all queries are still new, never seen before by Google. So likely many of those queries are longer than just two words, making it fall within the long tail query realm.

But while searchers are still very likely to search with many keywords, optimizing for it in the days of Google Panda is probably way dead.

Greg knows that, he said:

I think we would all love to grow our traffic and audience by 15%, so how are you addressing these unique searches? How are you monitoring so you can identify relevant trends in these unique searches? When you spot a trend in these unique searches, how are you responding to it?

You simply cannot create web pages with the goal of acquiring search referrals, Panda is about preventing those goals.